A 10pJ/bit 135Mbps IR-UWB transmitter using pulse position modulation and with on-chip LDO regulator in 0.13µm CMOS for biomedical implants

This paper describes a compact low-power high-datarate impulse radio ultra wideband (IR-UWB) transmitter IC for biomedical implants. The transmitter is powered through an on-chip low-dropout (LDO) regulator to tune its oscillation frequency which, together with the pulse width control, ensures that the transmitted pulse's power spectral density (PSD) fits within the FCC mask and has a BW ≥ 500MHz. The transmitter uses pulse position modulation (PPM) and the maximum measured datarate is 135Mbps with a figure of merit of 10pJ/bit. The chip is fabricated in 0.13μm CMOS. The core VCO occupies (35 × 125)μm2 area, while the area of both the regulator and the PPM oscillator is (0.325 × 0.17)mm2.

[1]  Marco Crepaldi,et al.  An Ultra-Low-Power interference-robust IR-UWB transceiver chipset using self-synchronizing OOK modulation , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[2]  L.S. Theogarajan.  A Low-Power Fully Implantable 15-Channel Retinal Stimulator Chip , 2008, IEEE Journal of Solid-State Circuits.

[3]  Bram Nauta,et al.  Linear CMOS transconductance element for VHF filters , 1989 .

[4]  A.P. Chandrakasan,et al.  An Energy-Efficient All-Digital UWB Transmitter Employing Dual Capacitively-Coupled Pulse-Shaping Drivers , 2009, IEEE Journal of Solid-State Circuits.

[5]  David D. Wentzloff,et al.  A 47pJ/pulse 3.1-to-5GHz All-Digital UWB Transmitter in 90nm CMOS , 2007, 2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers.

[6]  W. Liu,et al.  A 128-Channel 6 mW Wireless Neural Recording IC With Spike Feature Extraction and UWB Transmitter , 2009, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[7]  R.R. Harrison,et al.  A Low-Power Integrated Circuit for a Wireless 100-Electrode Neural Recording System , 2006, IEEE Journal of Solid-State Circuits.

[8]  G. Cauwenberghs,et al.  Wireless multichannel acquisition of neuropotentials , 2008, 2008 IEEE Biomedical Circuits and Systems Conference.

[9]  Teresa H. Y. Meng,et al.  A programmable pulse UWB transmitter with 34% energy efficiency for multichannel neuro-recording systems , 2010, IEEE Custom Integrated Circuits Conference 2010.

[10]  J. A. De Lima.  A linearly-tunable OTA-C sinusoidal oscillator for low-voltage applications , 2002 .